Water-tube boiler



(No Model.)

2 ySheets--Sheet 1.

L. M. MoYEs. WATER TUBE BOILER.

y Patented Aug. 21, 1894.

Dou ml. N m .NZ M.

2 Sheets-Sheet 2.

(No Model.) Y L. M. MOYES.

WATER TUBE BOILER.

No. 524,724. Patented Aug. 21, 1894.

fm/RANK...

INVENTOR UNITED STATES PATENT OFFICE.

LAURIE M. MOYES, OFY PHILADELPHIA, PENNSYLVANIA.

WATER-TUBE BOILER.

SPECIFICATION forming* part 0f Letters Patent N0. 524,724, dated August 21, 1894.

Application lerl March 30, 1894. Serial No. 505,671. (No model.)

To a/ZZ whom it may concern:

Be it known that I, LAUEIE M. MOYEs, of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Water-Tube Boilers, whereof the following is a specification, reference being had to the accompanying drawings.

In said drawings Figure 1 represents a vertical longitudinal section through the furnace, showing the boiler and accessories in side ele; vation. Fig. 2 is a vertical transverse section through the furnace, showing the boiler in front elevation. Fig. 3 is a sectional view on the line 3 3 of Fig. 1', looking in the direction of the arrows.

Referring to the drawings, A represents the wall of the furnace and, a, the grate-bars, A', indicating the bridge wall over the grate, and A2 a transverse iiame wall above said bridge. The chimney flue leads from the rear portion, A5, of the furnace. Transversely across the top of the furnace are arranged three parallel drums, B, B', B2, respectively, the first mentioned of which is the feed water drum. A two-fold direct communication is maintained between the adjacent drums above and below the normal water level as follows: The feed water drum, B, communicates with the drum,

l B', below the normal water level by a series of transverse pipes, b, and above the normal water level by a series of transverse pipes, b. Similarly, the drum, B', communicates with the drum, B2, below the. normal water level by a series of transverse pipes, b2, and

above the normal water level by a series of transverse pipes, b3. The respective sets of transverse pipes are slightly arched in opposite directions, as shown in Fig. 1, and above the lower pipes, h and h2, the brick work of the furnace extends between the drums, as indicated at A3, a protecting covering being also arranged above the upper pipes, b' and b3, as shown at A4.

From the feed water drum, B, a transverse row of downwardly depending inclined tubes, C, leads to the upper ends of a series of manifolds, F, the lower ends of said manifolds eX- tending into the transverse cylindrical distributing chamber, E. From the drum, B', four transverse rows of inclined tubes, C', lead down also into the manifolds, F, as indicated in Fig. 3. From the drum, B2, four similar transverse rows of inclined tubes, C2, lead down to a series of manifolds, F', similar in construction to the manifolds, F, except that they are slightly shorter, and said manifolds, F', are supported by and communicate with the cylindrical distributing chamber, E', which in turn communicates with the chamber, E, by the transverse tubes, e.

Opposite to the ends of the respective tubes, C, C', and C, the manifolds, F and F', are provided with removable plugs, f and f', respectively, to permit access to the tubes for cleaning purposes.

Inclined detlector plates, D, and D', respectively, are arranged in rear of the group of tubes, C, and in rear of the group of tubes, O2. The feed water drum, B, is provided with an inlet pipe G, and the drum, B', with a steam outlet, H.

The` operation of the device is as follows: Assuming that all three drums and the system of tubes are filled with water to a level above that of the pipes, b and b2, when the fire is started, the hottest ame impinges upon the group of pipes, C2, and the products of combustion thence pass down behind the deflector plate, D', in contact with the groups of tubes, O' and C, finally passing away at the rear of the furnace. Upward circulation of the water is therefore induced primarily and ,most forcibly in the group of tubes, C2, and secondarily, and to a less degree, in the group of tubes, C', and overflow of water will therefore occur from the drum, B2, to the drum, B', through vthe communieating tubes, b2, and a second overiiow will occur through the tubes, b, from the drum, B', into the feed water drum, B. The feed water enters the drum, B, by the inlet pipe, G, and descends in accordance with the demands of the boiler through the tube, C, into the manifolds, F. A portion of the entering water will be drawn up the tubes, C', but the remainder will pass down into the distributing chamber, E, thence across into the secondary distributing chamber, E', whence it will rise into the manifolds, F', and be drawn up the tubes, C2, into the drum, B2. Thus there is a continuous upward circulation through both groups of tubes and an overiow of hottest water into the central drum, B', whence a secondary overflow into the feed water drum oc- ICO 25 rent in the two hot'groups of tubes.

curs. Steam communication between the drums 1s of course maintained through the transverse tubes, b3 and b.

The feature of the return circulation into 5 the feed water drum through the tubes, b, in

conjunction with the circulation effected by the remainder of the organization is of great importance for preventing irregular action, and while I am of course aware that it is not 1o broadly speaking new to employ drums with downwardly depending groups or tubes, nor to return the water of circulation into the feed water drum, I believe that I am the first to employ this feature in an 'organization' of 15 the general character herein set forth.

As compared with boilers which employ only two groups of tubes, my improvements have the advantage of insuring proper circulation, since in my organization the ascendzo ing circulation induced in the primary and secondary groups, both of which are much hotter than the feed-water group, compels the descent of the feed-water by reason of the great preponderance of the upward cur- There is, therefore, no danger of the water being driven out of the feed-water tubes by undue heating thereof, as compared with the other groups. It is in connection with such an or- -3o ganization, having such a preponderance of circulation in the parts indicated, that the return of the water of circulation to the feed water drum is of special value, since the overtiow of the preponderating up currents 3 5 into the feed-water drum maintainsan equal distribution of water in the drum, instead of VYdrums, said tubes being arranged both above and below the normal water level; the downwardly depending groups of tubes connected respectively with said drums, B and B2; the manifolds, F and F', communicating respectively with said groups of tubes; the distributing chambers, E and Ef, connected respectively with said manifolds and communicating with one another; and the downwardly depending group of tubes, C, leading from the feed water drum to the rear manifolds, said last mentioned group of tubes being of less area of cross-section than the other groups, whereby the preponderance of upward circulation is induced in the primary and secondary groups, the descent of they feed-water is insured and an equal distribution in the drums is maintained by the water overfiow, substantially as set` fort L. M. MOYES. Witnesses:

JAMES H. BELL, G. HERBERT JENKINS. 

